Pump, motor, and the like



July 13, 1954v E. w. WOYDT PUMP, MOTOR AND THE LIKE 2 Sheets-Sheet 1 Filed April 12. 1950 lnvenfor: I H 0 y 62 July 13, 1954 E. w. WOYDT PUMP, MOTOR AND THE LIKE 2 Sheets-Sheet 2 Filed April 12, 1950 lnvemor:

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Patented July 13, 1954 UNITED STATE ATENT OFFICE Claims priority, application Germany January 5, 1950 8 Claims.

In known liquid pumps and motors with radial plungers actuated by means of an eccentric, large pressure forces act between the two constructional parts, viz. an internal and an external part, and these forces are transmitted by means of bearings to the casing or the frame respectively and thereby cause extensive stresses of the bearings which produce great friction in the bearings.

It is known to provide an assembly wherein the casing is provided with radially disposed cylinders and the pistons moving therein being actuated by an eccentric located between the cylinders. The eccentric is carried by a shaft suitably connected to the cylinder block and control members open and close the inlet and outlet passages leading to the cylinders. The eccentric is held stationary with respect to the shaft and is adjustable at a point opposite the means connecting the eccentric to the cylinder block.

However, the prior assembly is only suitable for low pressures whereas the present invention provides a machine which is adapted for use at high pressures, high efficiency and high rotary speeds.

Applicant achieves such ends, inter alia, by

' providing the control members for the inlet and outlet members or passages in a rotating unitary assemblage.

In an embodiment of the invention there is envisaged an arrangement intended to develop and arrange the control of the working plungers in a particularly suitable manner. Thereby the control devices are constructed in such a manner that they work satisfactorily also with high output, high speed and high pressure.

Subsequently for each working cylinder a control member via. a plunger slide valve controlled by a fixed eccentric or eccentric ring is arranged on or in the disc connecting the drum and the shaft. A particularly advantageous embodiment to the control members is obtained in such a manner that the disc preferably journalled by means of a hollow shaft receives a supplying or discharging tube which is non-rotatable, whereby any gap between the disc and the discharge tube is sealed by means of a stuffing box'or a packing device. The discharge system is arranged in such a manner that an annular recess is preferably provided for the supply connection in the disc in which a double-walled tube is nonrotatably arranged, the disc and the doublewalled pipe also being sealed against each other by means of stuffing boxes or packing devices.

In order to obtain a correct centering of the guide ring actuating the control members-towards the disc, the guide ring is journalled on the hollow shaft of the disc and secured against rotation by means of a suitable connection with the casing of the pump. This arrangement against rotation may be loosened and adjusted so that the control of the pump can be influenced by adjusting the guide ring of the control members.

The invention has for its further object an advantageous performance of those parts which serve to transmit the pressure from the eccentric to the working plungers. In order to free the working plungers from lateral forces use is made of rotatable rings, hitherto known, which connect each two plungers opposite each other, while the plungers have support on the eccentric ring by means of slidable shoes.

Figure 1 is a vertical section through a pum according to the invention on the line II of Figure 2.

Figure 2 shows sections of Figure 1, II being a section on the line IIII, III a section on the line III-III and IV being a section on the line IV-IV of Figure 1.

Figure 3 is a section on the line VV of Figure 1, and

Figure 4 is a section on the line VI-VI of Figure 1.

In the example according to Figures 1 to 4;, the cylinder block, is journalled within a casing IUI of a pump. This cylinder block consists of a drum I02 and a shaft I03 rigidly connected with the drum I02 by means of a disc-shaped member I64. Opposite th shaft m3 the cylinder block is provided with a hollow shaft IBI which is journalled within the casing Id! like the shaft I03. The end I85 of the shaft I93 serves for driving the pump. A double-eccentric I56, it]? is mounted on the shaft m3 and is adapted to be adjustable by means of worm gears H33 and I653. The double-eccentric serves to drive the plungers E III slidable in cylinders I I I of the drum I02. The cylinders extend to the circumference of the drum I02 but are closed there by means of closing plugs H2. The plunger IN] is provided with a transverse head II 3 rigidly connected with a similar transverse head II3 of the opposite plunger II by means of two rings I62 in such a manner that the plungers IIB are kept from oblique displacement in their cylinders thus preventing wear therebetween. The transverse heads H3 are connected with the ring 62 by means of bolts I63. A rocking member H4 is located in the transverse head H3 and is movable on the transverse head H3 by means of a cylindrical face H5. The rocking member is provided with a cylindrical cavity shaped symmetrically in the rotating direction in which a head II 6 provided with a slide shoe Ill is capabl of swivelling. The diameter of the symmetrically formed head I I6 increases from the outside to the inner side. The slide shoe Ill carries on its pivots H8 rollers H9 for running on guideways Ill and I2I. These latter are arranged on rings 122 and I rigidly connected with the drum M2. The rocking member has some clearance in the transverse head IE3 of the plunger (see Figures 1 and 2) so that the tangential component of the pressure transmittedfrom the eccentric I93 to the plunger I Ii? can freely be transmitted to the guideways I20 or "I'2I respectively. The second pair of plungers not illustrated in Figure 2 are rigidly connected to "each other by means of rings I23 in a corresponding manner.

Control valves I33 control the working plungers III! and are arranged movably in cylindrical bores I34 in the disc I04 of the cylinder block. Channels I35 connect the working cylinders Ill ith the control cylinders I34, while channels I36 and I3'i connect the control cylinder #3 5 with the pressure line I38 or the supply line I33 respectively.

The arrangement is such that'the control slide valves I33 close all channels towards each other in the middle position shown in Figure 1, but when sliding towards the inner side they effect communication of the channel I35 with the channel I35 and when sliding towards the outer side they effect communication of the channel I35 with the channel I31. ring I48 serves to control the control slide valves I33 and engages the head I4I of the latter by means of angle rings I42. The eccentric ring I40 is centrally journalled at I43 on a hollow shaft I6I of the cylinder block and is fixed by a 1 set screw I44 and nut I41, the neck I45 of which screw is movably mounted within a slot I46 of the casing Iill, The ring I40 will be secured towards the casing by tightening the nut I ll.

Within the hollow shaft I3! there is an annular recess in which a double walled tube I48 is fitted and sealed towards the hollow shaft ISI by means of'a packing device I49 and also towards a second shaft I59 rigidly connected with the cylinder block by means of 'a packing device I5I A tube I52 is located within the hollow shaft I58 and also sealed towards the hollow shaft ibd by means or" a packing device I53. The double walled tube I48 as well as the tube I52 remain at rest during the work of the pump and are connected with each other on the outside of the casing Illl by roean's'of cover plates I5 1 as well as with the casing IIlI by means of a flange I55. On the circumference of the double-walled tube I48 is arranged an annular groove I56 connecting the channels 53? and communicating with a suction pipe I59 through holes I34 within the double-walled tube I45. A corresponding annular groove Hi5 connecting the channels I36 is provided around the tube [52 which has two or An eccentric guide more holes I5? within the range of said annular groove. The tube I52 is provided with a flange I58 with which the pressure piping communicates, while an inlet I59 and a flange I connect with the supply piping.

It will be understood that the pivoting arrangement of the slide shoe 15'! provided with rollers H9 in the rocking member H4 arranged on the plunger transverse head H3 may also be used advantageously in engines which operate in another manner than that described above. The shaft of the unitary assembly can bend under high liquid pressure which acts upon the pistons of one side of the pump or motor. Thus,

the sliding shoes are slightly swingable axially Withrespect to the pistons Hi guidable in the cylinders HI.

I claim:

1. In a hydraulic pump or motor, a casing, a cylinder block within the casing, radially dis posed cylinders in the cylinder block, a piston movable in each cylinder, an eccentric located between the cylinders for actuating pistons, a shaft extending into the casing and supporting th said eccentric, a disc-shaped member within the casing, means defining a rigid connection between the shaft, disc-shaped member and the cylinder block thereby providing a unitary assemblage consisting of the block, shaft and discshaped member, means constituting inlet and outlet passage in said unitary assemblage leading to and from said cylinders, control elements in said unitary assemblage to control the opening and closing of said passages, each centrol element being in proximity to a cylinder and means associated with said eccentric to adjust the position thereof on said shaft.

2. A hydraulic pump or motor as defined in claim 1 further characterized in that an eccentric guide ring journalled on a shaft within the casing cooperates with said control elements to move such elements.

3. A hydraulic pump or motor as defined in claim 2 further characterized in that said control elements are slide valves located in the discshaped member and the pistons move in cylinders formed in a drum which defines part of the cylinder block and said eccentric moving the pistons being a double eccentric.

4. A hydraulic pump or motor as defined in claim 1 further characterized in that said discshaped member is provided with a hollow shaft having connections adapted to be associated with liquid supply and discharge conduits and a sealing device for said disc-shaped member and each connection.

5. A hydraulic pump or motor as defined in claim 1 further characterized in that said discshaped member is provided with a hollow shaft having connections adapted to be associated with liquid supply and discharge conduits and a seal ing device for said disc-shaped member and each connection, said disc-shaped member having an annular recess in which said connections are non-rotatably disposed.

6. A hydraulic pump or motor as defined in claim 1 further characterized in that each piston is provided with a transversely disposed head, the heads of every two pistons arranged opposite each other being connected by two laterally disposed rings.

'7. A hydraulic pump or motor as defined in claim 1 further characterized in that a drum forming part of the said cylinder block is provided with the cylinders, said drum having rings with lateral guideways, the pistons each having transversely disposed heads with a rocking member located therein, a shoe swingably mounted in said rocking member and movable against said eccentric, said shoe carrying rollers for transmitting tangential forces onto said lateral guideways.

8. A hydraulic pump or motor as defined in claim 1 further characterized in that a drum forming part of the said cylinder block is provided with the cylinders, the said drum having rings with lateral guideways, the pistons each having transversely disposed heads with a rocking member located therein, a shoe swingably mounted in said rocking member and movable against said eccentric, said shoe carrying rollers for transmitting tangential forces onto said lateral guideways, said rocking member having a cavity carrying a head by means of which the shoe is j ournalled in said rocking member.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,308,436 Maw et a1 July 1, 1910 1,709,194 Hale-Shaw et a1. Apr. 16, 1929 1,757,483 Hele-Shaw et a1. May 6, 1930 1,778,238 Wilsey Oct. 14, 1930 2,115,121 Phillips Apr. 26, 1938 2,141,167 Bishof Dec. 27. 1 938 2,159,005 Centervall May 23, 1939 2,257,792 Fletcher Oct. 7, 1941 2,418,123 Joy Apr. 1, 1947 

